Question

maximum cardinality indicates whether or not an instance of one entity class must be related to at least one instance of another entity class.

Answer 1

This is false.

What is cardinality?

Cardinality refers to the entity instances for which it is eligible to participate in a relationship instance. There are two types of cardinality, maximum and minimum.

What is maximum cardinality?

• The maximum cardinality of a relationship is the maximum number of instances of entity B that may be associated with each instance of entity A.
• Maximum cardinality: maximum number of entity instances that can participate in a relationship.

1. One-to-One [1:1]
2. One-to-Many [1:N]
3. Many-to-Many [N:M]

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